Oil pump



May 14, 1929. A. E. DAVENPORT OIL PUMP Filed July 50, 1927 2 Sheets-Sheet 1 Zlwvmatop i fi/sW/WPa/W; m, 2

May 14, 1929. A. E. DAVENPORT OIL PUMP Filed July 30, 1927 2 Sheets$heet 2 Patented May 14, 1929.

UNITED STATES- 1,713,424 PATENT OFFICE.

ARTHUR E. DAVENPORT, OF HAYWOOD, ILLINOIS, ASSIGNOR TO OIL PRODUCTS APPLI- ANCE (10., F. HAYWOOD, ILLINOIS, A CORPORATION OF ILLINOIS.

on. PUMP.

. Application filed July 30,

Objects of the invention are to simplify the construction, lessen the cost of production, and increase the efficiency of oil pumps.

The nature, characteristic features, and scope of the invention will more readily be understood from the following description, reference being had to the annexed drawings, wherein Figure 1 is a plan View of the pump.

Fig. 2 is a section on line 2-2 of Fig: 1.

Fig. 3 is a section on line 33 of Fig. 1.

r Fig. 4 is a sectional view of the nozzle.

Figs. 5 and 6 show details of the handle. In the drawings, the numeral 5 indicates the head sheet of a tank of usual construction,

having an opening 6 for a stub or suction tube 7, equipped as usual with a foot valve, not

shown. 8 is a unit construction directly bolted to the head sheet of the tank in operative relation to the stub 7.

Element 8 is a die cast shell construction which integrally embodies a' pump cylinder 9, a suction connection 10 and an oil delivery passage 11. A depending flangeor skirt 12 affords means for directly securing the unit construction to the head sheet of the tank, it being understood that the ipe connection 10 carries the stub 7. The solid or integral construction described, whereby the delivery element or oil way 11 is consolidated with and ranges the length of the pump cylinder, is important not only because it simplifies and lessens the cost of production but also for the reason that it obviates the several unions and their attendant gaskets and packing glands, heretofore required.

The cylinder is fitted with a piston 13 which on its up-stroke sucks oil and on its down stroke delivers oil, no oil bypassing the piston. The piston is carried by a rack 14 which is completely enclosed by the cylinder and by a housing 15 bolted to the cylinder flange 16. The rack is operated by a pinion 17, which as will be apparent from inspection of Figs. 5 and 6. is an integral part of the shaft extension 18 of an operating handle 19. The shaft is journaled in the rack housing 15, and is continued beyond the same to actuate a registering device or meter, not shown. An adjustable abutment 20 mounted in the top of the rack housing is a simple provision for defining the limitof upward traverse of the rack. The housing is vented, as will be understood, to prevent the building up of pressure on the top side of the piston. It is a' 1927. Serial No. 209,592.

merit of the invention that this, preferably, is accomplished by a tubular arm, Fig. 3, fprmed integral with the cylinder construction, and ranging alongside the delivery arm 11, the breather arm communicating near its top with the cylinder space above the piston and at its bottom with the tank. Aside from 1ts function as a breather element, the tubular arm referred to operates to lead back to the tank any oil which casually may creep past the piston. I

The solid construction of the pump cylinder and its delivery duct or passage 11 makes for rigid support of the usual gooseneck connection 21, which is particularly desirable when receptacles for oil are loaded on the nozzle portion. The gooseneck is externally threaded to engage the tapped area 22 of'the oilway 11. The lower end of the latter is provided with a seat 23 for, for example, a ball check 24 Such provision is not necessary,

however, when, as is preferred, the ball is mounted in the. nozzle, as shown in Fig. 4. A nozzle construction of this type is particularly desirable because it will deliver a solid stream of oil a substantial distance, say three feet or more, beyond the tip and because it willnot drip when the flow is cut off. The port 25 of the nozzle affords a rim seat for a flow responsive ball or other check 26, which normally is spring pressed upwardly to its seat. The spring 27 is constructed to nestthe ball and is of the quick acting t pe. In the embodiment shown it is carried by a detachable tip 28 the bore of which has cencentric stages or steps 29, the number of which may vary. These sta es have a dual ur se, to equalize flow, an to trap oil whic ot erwise would drip. Thenozzle per se is claimed in another application.

When an ordinary nozzle is employed, any usual'provision may be ncluded in the assembl to return the drip to the tank. The base ange of the'cylinder has an opening to accommodate the return connection, which opening, in the present instance is plugged, as at 30. Advantage is also taken of the flange to provide an upstanding lug 31 having' an opening 32, whereby a locking means may be interposed between it and theoperating handle.

Having described my invention, I claim:

1. A die-cast unit construction comprising a base for attachment to a tank, a cylinder rising therefrom and afiorded a common suction and delivery passage in the base, and conduits rising from the base and formed as ofl'sets of the cylinder and whereof one constitutes a delivery arm and whereof the other constitutes a' connection for establishing communication between the top of the cylinder and the tank.

2. An oil pump, comprising, in. combination, a tank, a die-cast unit construction embodying a base for closing an opening in the tank, cylinder, delivery arm, and breather elements formed as a single riser of the base, the cylinder having a common suction and delivery area in the base, and'the breather element establishing communication between the top of the cylinder and the tank, a check for the delivery arm, a piston mounted in the cylinder for movement close to the base, a cylinder head, and means for operating the piston.

In testimony whereof I aifix my signature.

ARTHUR E. DAVENPORT. 

